The official history of Monopoly, as told by Hasbro, which owns the brand, states that the board game was invented in 1933 by an unemployed steam-radiator repairman and part-time dog walker from Philadelphia named Charles Darrow. Darrow had dreamed up what he described as a real estate trading game whose property names were taken from Atlantic City, the resort town where he’d summered as a child....
The game’s true origins, however, go unmentioned in the official literature. Three decades before Darrow’s patent, in 1903, a Maryland actress named Lizzie Magie created a proto-Monopoly as a tool for teaching the philosophy of Henry George, a nineteenth-century writer who had popularized the notion that no single person could claim to “own” land. In his book Progress and Poverty (1879), George called private land ownership an “erroneous and destructive principle” and argued that land should be held in common, with members of society acting collectively as “the general landlord.”
Magie called her invention The Landlord’s Game, and when it was released in 1906 it looked remarkably similar to what we know today as Monopoly. It featured a continuous track along each side of a square board; the track was divided into blocks, each marked with the name of a property, its purchase price, and its rental value.... The Landlord Game’s chief entertainment was the same as in Monopoly: competitors were to be saddled with debt and ultimately reduced to financial ruin, and only one person, the supermonopolist, would stand tall in the end. The players could, however, vote to do something not officially allowed in Monopoly: cooperate. Under this alternative rule set, they would pay land rent not to a property’s title holder but into a common pot—the rent effectively socialized so that, as Magie later wrote, “Prosperity is achieved.”
From Harper's, the entire thing is worth a read.
As an aside, John von Neumann and Oskar Morgenstern's classic Theory of Games and Economic Behavior was based on earlier research by von Neumann entitled "On the Theory of Parlor Games." They likely had in mind games of the type and complexity that humans actually play and find interesting, rather than the artificially simplified games that now fall under the purview of game theory.